Control of fuel-air ratio in a spark ignition engine

In engines, fuel / air mixture ratio to the creation of a closed loop control system to keep its ideal value, reducing harmful exhaust emissions and better engine performance is necessary to be provided. Unburned hydrocarbons, and the three-function device reduce the amount of nitrogen oxide, carbon monoxide simultaneously oxidizing catalytic converter, fuel-air ratio of 0.068 (1 / 14.7) in the event of deviations from almost becomes ineffective. Researchers to achieve an ideal spot from variable time delay systems linear and nonlinear systems by making parameters of the system's performance and reliability are working. In this study, spark ignition engine fuel / air ratio control based on the weighted geometric center base robust PI control, weighted geometric center-base earnings should schedule PI control programs and gain the reference weight PI controller design is made.As a result of spark ignition engine fuel air ratio control system PI algorithm with Matlab / Simulink it was evaluated results obtained by performing the environment.